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Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
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Dec. 30, 2016 | Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Jul. 02, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 445.0 | $ 362.5 | $ 379.2 | $ 351.9 | $ 387.0 | $ 348.5 | $ 349.7 | $ 340.6 |  | $ 1,538.6 | $ 1,425.8 | $ 1,472.3
Gross profit (loss) |  | 135.2 | 87.7 | 97.7 | 90.1 | 80.9 | 85.1 | 76.1 | 88.1 |  |  |  |
Income from continuing operations |  | 39.3 | 6.8 | 19.7 | 12.4 | 60.0 | 22.0 | (8.3) | 10.3 |  | 78.2 | 84.0 | 30.3
Income (loss) from discontinued operations, net of tax |  | (0.1) | (0.2) | 3.3 | 0.0 | (1.4) | 0.3 | (0.7) | 7.1 |  | 3.0 | 5.3 | (97.9)
Net income (loss) |  | $ 39.2 | $ 6.6 | $ 23.0 | $ 12.4 | $ 58.6 | $ 22.3 | $ (9.0) | $ 17.4 |  | $ 81.2 | $ 89.3 | $ (67.6)
Basic income (loss) per share of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | $ 0.91 | $ 0.16 | $ 0.46 | $ 0.29 | $ 1.41 | $ 0.51 | $ (0.19) | $ 0.24 |  | $ 1.82 | $ 1.98 | $ 0.30
Discontinued operations, net of tax (in dollars per share) |  | (0.01) | (0.01) | 0.08 | 0.00 | (0.03) | 0.01 | (0.02) | 0.17 |  | 0.07 | 0.13 | (2.35)
Net income (loss) per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share) |  | 0.90 | 0.15 | 0.54 | 0.29 | 1.38 | 0.52 | (0.21) | 0.41 |  | 1.89 | 2.11 | (2.05)
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | 0.88 | 0.15 | 0.44 | 0.28 | 1.35 | 0.50 | (0.19) | 0.24 |  | 1.75 | 1.91 | 0.30
Discontinued operations, net of tax (in dollars per share) |  | 0.00 | 0.00 | 0.07 | 0.00 | (0.03) | 0.01 | (0.02) | 0.16 |  | 0.07 | 0.12 | (2.32)
Net income (loss) per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share) |  | $ 0.88 | $ 0.15 | $ 0.51 | $ 0.28 | $ 1.32 | $ 0.51 | $ (0.21) | $ 0.40 |  | $ 1.82 | $ 2.03 | $ (2.02)
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  |  | $ (107.6) | $ (59.9) | $ (70.0)
Revenues |  | $ 445.0 | $ 362.5 | $ 379.2 | $ 351.9 | $ 387.0 | $ 348.5 | $ 349.7 | $ 340.6 |  | 1,538.6 | 1,425.8 | 1,472.3
Cost of products sold |  |  |  |  |  |  |  |  |  |  | 1,127.9 | 1,095.6 | 1,096.5
Gain on contract settlement |  |  |  |  |  |  |  |  |  |  | 0.0 | 10.2 | 0.0
Recognized pre-tax actuarial losses |  | 6.6 |  |  |  | 4.2 |  |  |  | $ 1.8 |  |  |
Income tax benefit for worthless stock deduction |  |  |  |  |  | 77.6 |  |  |  |  |  |  |
Provisional net charge due to new tax regulations |  |  |  |  |  | 11.8 |  |  |  |  |  | 11.8 |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 3.0 | 5.3 | (81.3)
Engineered Solutions reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 537.0 | 560.7 | 598.0
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 537.0 | 560.7 | 598.0
Gain on contract settlement |  |  |  |  |  |  | 10.2 |  |  |  |  |  |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 98.6 | 93.8 | 138.4
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 98.6 | 93.8 | 138.4
Reportable and other operating segments |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  |  | (178.5) | (124.9) | (142.8)
Reportable and other operating segments | Engineered Solutions reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  |  | (35.0) | (44.2) | (39.1)
Reportable and other operating segments | All Other |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  |  | 18.9 | 56.8 | 21.8
South Africa |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 72.7 | 56.9 | 105.4
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 72.7 | 56.9 | 105.4
South Africa | Large Power Projects | Reportable and other operating segments | Engineered Solutions reportable segment | Revisions in estimates for large power projects |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  | (2.7) |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  | 4.7 |  |  | 29.9 |  | 22.9 |  |  |  |  |
Revenues |  |  | (2.7) |  |  |  |  |  |  |  |  |  |
Cost of products sold |  |  | $ 2.0 |  |  | 6.5 |  | 9.4 |  |  |  |  |
South Africa | Large Power Projects | Reportable and other operating segments | All Other | Revisions in estimates for large power projects |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | (23.4) |  |  |  | (23.4) |  | (13.5) |  |  | (2.7) | (36.9) |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  | 29.9 |  | 22.9 |  |  | 4.7 | 52.8 |
Revenues |  | (23.4) |  |  |  | $ (23.4) |  | (13.5) |  |  | (2.7) | (36.9) |
Cost of products sold |  | $ 6.5 |  |  |  |  |  | 9.4 |  |  |  | 15.9 |
U.S. Postretirement Plan (“OPEB”) |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
(Increase) decrease for remeasurement due to settlement |  |  |  |  |  |  | $ 2.6 |  |  |  |  |  |
Balcke Durr |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  | 3.8 |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Balcke Durr |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | $ 3.8 | $ 6.8 | $ (95.2)
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  | $ 3.8 |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Balcke Durr | Subsidiary of mutares AG (the Buyer) |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss recognized with disposition of business |  |  |  |  |  |  |  | $ 0.4 | $ 7.2 |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax | $ (78.6) |  |  |  |  |  |  |  |  |  |  |  |

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